Interim status surface impoundments may close per section 265.228(b) without groundwater wells but remain subject to a post-closure permit (SEE ALSO: 63 FR 56711; 10/22/98), close per section 265.288(c) and install wells when a post-closure permit is called, or close per section 265.228(b) with wells and show closure by removal (SUPERSEDED: see 3/19/87; 52 FR 8704).